My hardware is a DO box - 2GB Ram 40GB SSD Disk New York 3 Ubuntu 14.04 x64

I am deploying a web app in MeteorJS and I bump into a console error where it says

WebSocket connection to 'ws://12.123.456.78/sockjs/487/lttjh9gq/websocket' failed: Error during WebSocket handshake: net::ERR_CONNECTION_RESET

My deployment is done using https://github.com/arunoda/meteor-up, standard settings nothing special.

Anyone encountered the same problem and know how to fix this?